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(912.965.3000, www.gulfstream.com ) burns 170 gallons of fuel per hour, making it the most fuel-efficient jet in this category, and the one with the lowest variable costs per hour. And yet it offers an exceptional range of nearly 3,000 miles with four passengers on board, as well as a cruising speed of about 495 mph. This $15.6 million jet comfortably seats eight passengers in a roomy cabin that is 17 feet 8 inches long and 5 feet 9 inches tall and wide. The capaciousness extends to the baggage areas, which provide a total of 80 cubic feet of storage space.